CN106031278A - Terminal and method for transmitting device to device (d2d) signal for d2d communication in wireless access system supporting d2d communication - Google Patents

Abstract

Disclosed is a method for transmitting a device to device (D2D) signal for D2D communication by a D2D terminal in a wireless communication system. The method for transmitting the D2D signal may comprise the steps of: selecting a particular resource set on a D2D resource area configured for the D2D communication; and transmitting the D2D signal using at least one wireless resource corresponding to the particular resource set, wherein the D2D resource area includes multiple resource sets, and the multiple resource sets are individually associated with different cells and correspond to different resource areas on a time domain.

Description

Support D2D communication wireless access system in send for D2D communication equipment to The terminal of equipment (D2D) signal and method

Technical field

The present invention relates to wireless access system, and more specifically, relate in the radio communication supporting D2D communication The method selecting the resource collection of device-to-device subscriber equipment (D2D UE) in system.

Background technology

Recently, along with smart phone and the propagation of flat board PC and the activation of high power capacity multimedia communication, mobile service is Significantly increase.Media expect that mobile service is double.Because sending most of mobile service by base station (BS), so communication clothes Business operator faces serious offered load.In order to process growing business, common carrier can install network and Acceleration can process the such as mobile WiMAX of substantial amounts of business or the of future generation mobile logical of Long Term Evolution (LTE) efficiently The commercialization that beacon is accurate.It is, however, required that process another solution of greater number of business in future.

D2D communication refer to in the case of the framework not using such as BS between continuous print node directly Transmission business by scattered communication technology.Under D2D communication environment, each node of mancarried device etc. is searched physically Adjacent device, configures communication session, and the business of transmission.Such D2D communication is focused at BS owing to it has by distribution On business process the ability of business load, so the technical foundation as the next generation mobile communication after 4G is concerned. To this end, such as the ANSI of third generation affiliate (3GPP) or electric electronic engineering association (IEEE) is based on senior LTE Or Wi-Fi is setting up D2D communication standard and high pass etc. and developing independent D2D communication technology (LTE-A).

Expectation D2D communication not only helps increase the performance of mobile communication system and creates new communication service.Additionally, Can be supported based on adjacent social networking service or network game service.Use D2D link is as relay station, at shade The connectivity problem of the device in region can be overcome.Therefore, expect that D2D technology provides new service in various fields.

It is true that such as infrared communication, purple honeybee, RF identification (RFID) have been widely used.But, strictly Say, for these technology, be difficult to the D2D communication of the business for disperseing BS that is classified into, shown because they are only supported at Write the specific communications purposes in the distance (about 1m) that ground limits.

Although being described above D2D communication, but the money for being distributed D2D communication is not the most proposed The method in source.

Summary of the invention

Technical problem

The invention aims to provide a kind of use by multiple resources in the wireless communication system supporting D2D communication The D2D resource area that set (or resource polymerization) forms performs the method for communication.

It is another object of the present invention in order to provide a kind of for support D2D communication wireless communication system in by wireless Electric resources is distributed to the method for continuous community.

It is another object of the present invention to provide a kind of for synchronizing use in the wireless communication system supporting D2D communication The method of the D2D signal of family equipment (UE).

It will be appreciated by those skilled in the art that the purpose that the present invention should realize to be not limited to the most specifically to retouch That state and understand the above and other purpose that the present invention should realize with will be more readily apparent from from the following description.

Technical solution

By providing one in a wireless communication system in order to D2D communication is set by first user equipment (UE) transmission The standby method to equipment (D2D) signal is capable of the purpose of the present invention, and the method includes: select for D2D communication configuration D2D resource area in specific resources set；And use at least one radio money corresponding with specific resources set Source sends D2D signal, and wherein D2D resource area includes that multiple resource collection, multiple resource collections mutually close with different districts Join and corresponding to the different resource region in time domain.

In a still further aspect thereof, a kind of in a wireless communication system in order to D2D communication transmission equipment is to setting The subscriber equipment (UE) of standby (D2D) signal, including: radio frequency (RF) unit；And processor.This processor is configured to: select Specific resources set in the D2D resource area for D2D communication configuration, and use corresponding with specific resources set At least one radio resource sends D2D signal.D2D resource area includes multiple resource collection, and multiple resource collection Interrelated with different districts and corresponding to the different resource region in time domain.

Beneficial effect

It is apparent that the resource that embodiments of the invention can improve D2D communication system uses effect in from the description above Rate.

It addition, embodiments of the invention can provide higher D2D communication quality by being spatially separating of D2D UE.

It will be appreciated by those skilled in the art that the effect that the present invention can be utilized to realize to be not limited to retouching specifically above The effect stated, and understand other advantages of the present invention with will be apparent from from the detailed description below combining accompanying drawing.

Accompanying drawing explanation

Accompanying drawing is included to provide the part being further appreciated by and being merged in and form the application of the present invention, it is illustrated that Embodiments of the invention and the principle of the present invention that lays down a definition together with description use.In the accompanying drawings:

Fig. 1 is the block diagram of the configuration illustrating base station (BS) and subscriber equipment (UE) in a wireless communication system.

Fig. 2 is exemplarily illustrated radio frame structure.

Fig. 3 is exemplarily illustrated the resource grid of a downlink time slots.

Fig. 4 is exemplarily illustrated downlink (DL) subframe structure.

Fig. 5 is exemplarily illustrated up-link (UL) subframe structure.

Fig. 6 is the concept map that diagram includes up-link (UL) subframe of detection reference signal (SRS) symbol.

Fig. 7 is the concept map illustrating D2D resource distribution according to an embodiment of the invention.

Fig. 8 is the concept map illustrating D2D resource collection (or polymerization) according to an embodiment of the invention.

Fig. 9 is the concept map illustrating the selection of D2D resource collection and Serving cell according to an embodiment of the invention.

Detailed description of the invention

Structural detail and feature by the present invention realize following embodiment with the combination of predefined type.Structural detail or Each in person's feature is considered as optionally, unless individually specified.Can not with other structural details or spy Levy combined in the case of implement in structural detail or feature each.Additionally, some structural details and/or feature can be with those This combination is to constitute embodiments of the invention.The operation order described in an embodiment of the present invention can change.One enforcement Some structural details of example or feature can be included in another embodiment, or may alternatively be the phase of another embodiment Answer structural detail or feature.

In this manual, it will send based on the data between base station BS and user equipment (UE) and receive the description present invention Embodiment.In the case, base station BS refers to the terminal node of network, and it performs to communicate with the direct of user equipment (UE).Root According to situation, can be performed, by the upper layer node of base station, the specific operation that is described as being performed by base station.

In other words, it will it is apparent that with include the network of multiple network node and base station leads to subscriber equipment The various operations that letter UE performs can be performed by base station BS or the network node in addition to base station BS.Now, base station BS is permissible It is replaced by such as fixed station, node B, e node B (eNB) and the term of access point (AP).Via node can be replaced by all Such as via node (RN) and the term of relay station (RS).It addition, " terminal " can be replaced by such as subscriber equipment (UE), move Stand (MS), mobile subscriber station (MSS) and the term of subscriber station (SS).

There is provided particular term the most used below to help the understanding of the present invention, and Without departing from carrying out various amendment in the range of the technical spirit of the present invention in particular technology.

In some cases, in order to prevent idea of the invention from obscuring, the construction and device of prior art will be omitted, or Person's major function based on each construction and device illustrates in form of a block diagram.Additionally, as possible, in whole drawing and description In, it will use same reference numbers to refer to same or similar part.

The enforcement of the present invention can be supported by the standard document disclosed at least one in following wireless access system Example, i.e. IEEE 802 system, 3GPP system, 3GPP LTE system, 3GPP LTE, 3GPP LTE-A (senior LTE) system and 3GPP2 system.That is, among embodiments of the invention, can be clear for the technical spirit of the present invention by above-mentioned document support Chu and the obvious step that do not describes or part.Furthermore it is possible to describe all technology disclosed herein by above-mentioned standard document.

Techniques below may be used for various wireless access system, such as CDMA (CDMA), FDMA (frequency division multiple access), TDMA (time division multiple acess), OFDMA (OFDM) and SC-FDMA (single-carrier frequency division multiple access).CDMA can be by wireless Power technology realizes, and such as universal terrestrial radio accesses (UTRA) or CDMA2000.TDMA can be come by radiotechnics Realize, such as global system for mobile communications (GSM)/GPRS (general packet radio service) (GPRS)/enhanced data rates for gsm evolution (EDGE).OFDMA can be realized by radiotechnics, such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), the UTRA (E-UTRA) of IEEE 802.20 and evolution.UTRA is a part of Universal Mobile Telecommunications System (UMTS). Third generation partner program Long Term Evolution (3GPP LTE) communication system is the UMTS (E-UMTS) of the evolution using E-UTRA A part, and use OFDMA at downlink, and use SC-FDMA on uplink.Senior LTE (LTE-A) is The evolution version of 3GPP LTE.WiMAX can pass through IEEE 802.16e standard (wireless MAN-OFDMA reference system) and senior IEEE 802.16m standard (wireless MAN-OFDMA AS) is described.Although explained below will be based on 3GPP LTE System and 3GPP LTE-A so that describing clear, it is to be appreciated that, the technical spirit of the present invention be not limited to 3GPP LTE and 3GPP lte-a system.

There is provided the particular term being used for embodiments of the invention to help the understanding of the present invention.In the scope of the present invention and In spirit, these particular term can be replaced by other terms.

Fig. 1 is the block diagram of the configuration illustrating base station 105 and movement station 110 in a wireless communication system.

Although illustrating a base station 105 and a subscriber equipment (such as, D2D UE) to simplify wireless communication system 100 110, but wireless communication system 100 can include one or more base station and/or one or more subscriber equipment.

With reference to Fig. 1, base station 105 can include launching (Tx) data processor 115, Symbol modulator 120, emitter 125, Launch and reception antenna 130, processor 180, memorizer 185, receptor 190, symbol demodulator 195 and reception (Rx) number According to processor 297.Subscriber equipment 110 can include Tx data processor 165, Symbol modulator 170, emitter 175, launch and Reception antenna 135, processor 155, memorizer 160, receptor 140, symbol demodulator 155 and Rx data processor 150. Although antenna 130 and 135 is shown respectively in base station 105 and subscriber equipment 110, but in base station 105 and subscriber equipment 110 Each include multiple antenna.Therefore, multiple-input and multiple-output (MIMO) is supported in base station 105 and subscriber equipment 110 according to the present invention System.Additionally, single user-MIMO (SU-MIMO) system and multi-user-MIMO can be supported according to the base station 105 of the present invention (MU-MIMO) system.

On the uplink, Tx data processor 115 receives business datum, formats and compile the business number received According to, interweave and modulate the business datum that (or symbol mapping) is compiled, and the symbol (" data symbol ") modulated is provided. Symbol modulator 120 receives and processes data symbol and frequency pilot sign and provides the stream of symbol.

Symbol demodulator 120 multiplex data and frequency pilot sign and the data being re-used and frequency pilot sign are transmitted into transmitting Device 125.At this moment, the respective symbol being launched can be empty signal value, data symbol and frequency pilot sign.At each symbol In period, frequency pilot sign can be continually transmitted.Frequency pilot sign can be frequency division multiplexing (FDM) symbol, OFDM (OFDM) symbol, time division multiplex (TDM) symbol or code division multiplexing (CDM) symbol.

Emitter 125 receives the stream of symbol and changes the circulation received into one or more analog symbol.Additionally, Emitter 125 generates applicable by additionally controlling (such as, amplify, filter and up-conversion) analogue signal by radio channel Down link signal in transmission.Subsequently, by antenna 130 by downlink signal transmissions to subscriber equipment.

In the configuration of subscriber equipment 110, antenna 135 receives down link signal and will receive from base station 105 Signal is supplied to receptor 140.Receptor 140 controls signal and the numeral that (such as, filter, amplify and down coversion) receives Change controlled signal to obtain sampling.Symbol demodulator 145 demodulates the frequency pilot sign received and by demodulated pilot tone Symbol is supplied to processor 155 and estimates to perform channel.

Additionally, symbol demodulator 145 receives the frequency response estimated value for downlink from processor 155, by holding The data solution of the row data symbol for receiving transfers to obtain the data symbol estim (estimation of the data symbol being launched Value), and data symbol estim is supplied to Rx data processor 150.Rx data processor 150 demodulates that (that is, symbol goes to reflect Penetrate), deinterleave and decode data symbol estim with the business datum that is launched of recovery.

Process based on symbol demodulator 145 and Rx data processor 150 is based on symbol demodulator at base station 105 Supplementing of the process of 120 and Tx data processors 115.

On uplink, the Tx data processor 165 of subscriber equipment 110 processes business datum and provides data symbols Number.Symbol modulator 170 receives data symbol, data symbol that multiplexing reception arrives and frequency pilot sign, performs for being re-used The modulation of symbol, and the stream of symbol is supplied to emitter 175.Emitter 175 receives the stream with process symbol and generates Uplink signal.It is transmitted to base station 105 by antenna 135 uplink channel symbols.

Base station 105, receive uplink signal by antenna 130 from subscriber equipment 110, and receptor 190 processes The uplink signal received is to obtain sampling.Subsequently, symbol demodulator 195 processes sampling and provides for up-link The data symbol estim received and frequency pilot sign.Rx data processor 197 recovers by processing data symbol estim The business datum launched from subscriber equipment 110.

At subscriber equipment 110 and base station 105, the processor 155 and 180 of subscriber equipment 110 and base station 105 is ordered respectively (such as, control, regulate, management etc.) operation.Processor 155 and 180 can respectively with storage program code and the depositing of data Reservoir 160 is connected with 185.The memorizer 160 and 185 being respectively connected to processor 180 stores operating system wherein, answers With and generic-document.

Each in processor 155 and 180 can be referred to as controller, microprocessor, microprocessor and micro-calculating Machine.Meanwhile, processor 155 and 180 can be realized by hardware, firmware, software or combinations thereof.If by hard Part realizes embodiments of the invention, then be configured to perform the special IC (ASIC) of embodiments of the invention, numeral letter Number processor (DSP), digital signal processor (DSPD), PLD (PLD) and field programmable gate array (FPGA) may be provided in processor 155 and 180.

Meanwhile, if realized according to embodiments of the invention by firmware or software, then firmware or software can be by It is configured to function or the module of operation, process or the function including performing the present invention.It is configured to perform consolidating of the present invention Part or software may be provided in processor 155 and 180, or can be stored in memorizer 160 and 185 and lead to Cross processor 155 and 180 to drive.

Three lower levels based on known OSI (open system interconnection (OSI)) master pattern in a communications system set user The layer of the radio interface protocol between standby 110 or base station 105 and wireless communication system (network) can be classified into first Layer L1, second layer L2 and third layer L3.Physical layer belongs to ground floor L1 and uses physical channel to provide information transmission service. Radio resource controls (RRC) layer and belongs to third layer and provide control radio resource between subscriber equipment and network.With Family equipment and base station can be exchanged with each other RRC information by rrc layer.

Although UE processor 155 makes UE 110 receive signal and can process other signals and data, and BS process Device 180 makes BS 105 can send signal and process other signals and data, but in the following description will not be special Mention processor 155 and 180.Although mentioning processor 155 and 180 the most especially, but should note Meaning, processor 155 and 180 can not only process data transmission/receive capabilities and process such as data and process and control Other operation.

LTE/LTE-A resource structures/channel

With reference to Fig. 2, radio frame structure will be described now.

In cellular OFDM radio packet communication system, on the basis of subframe, send up-link (UL)/downlink (DL) packet, and subframe is defined to include the predetermined time interval of multiple OFDM symbol.3GPP LTE supports Can be applicable to the radio frame structure Class1 of FDD (FDD) and can be applicable to the radio frame structure of time division duplex (TDD) Type 2.

Fig. 2 (a) illustrated type 1 radio frame structure.Downlink radio frame is divided into 10 subframes.Each subframe exists Time domain is further split into two time slots.The unit interval sending a subframe during it is defined as Transmission Time Interval (TTI).Such as, a subframe can be the 1ms persistent period, and a time slot can be the 0.5ms persistent period.One time slot Include multiple OFDM symbol in the time domain, and include multiple Resource Block (RB) in frequency domain.Because 3GPP LTE system OFDMA is used to be used for downlink, so OFDM symbol represents a symbol period.OFDM symbol is properly termed as SC-FDMA symbol Number or the symbol period.RB is the resource allocation unit including multiple continuous print subcarrier in a slot.

Fig. 2 (b) illustrated type 2 radio frame structure.Type 2 radio frame includes two fields, and each have 5 sons Frame, down link pilot timeslot (DwPTS), protective time slot (GP) and uplink pilot time slot (UpPTS).Each subframe is divided Become two time slots.DwPTS estimates for search of initial zone in UE, synchronization or channel, and UpPTS is for believing in the enb Road estimation and the ul transmissions in UE synchronize.GP is the period between up-link and downlink, is used for eliminating With the interference by the up-link caused by the multidiameter of down link signal.Do not consider the type of radio frame, subframe bag Include two time slots.

Radio frame structure described above is merely exemplary, and it should therefore be noted that at radio frame neutron The number of frame, in subframe, the number of time slot or the number of symbol in a slot can change.

Fig. 3 diagram is for the resource grid of a downlink time slots.Downlink time slots includes 7 in the time domain OFDM symbol, and RB includes 12 subcarriers in frequency domain, and it does not limits the scope of the invention and spirit.Such as, just Often in the case of CP, time slot can include 7 OFDM symbol, and in the case of the CP of extension, time slot can include 6 OFDM Symbol.Each element of resource grid is referred to as resource element (RE).One RB includes 12 × 7 RE.In downlink time slots Number N DL of RB depends on downlink transmission bandwidth.Uplink time slot can have the knot identical with downlink time slots Structure.

Fig. 4 illustrates the structure of downlink subframe.In downlink subframe in the beginning of the first time slot until three Individual OFDM symbol for controlling the control area of channel to its distribution, and other OFDM symbol of downlink subframe are for right The data area of its distribution PDSCH.The downlink control channel used in 3GPP LTE system includes physical control format Indicator channel (PCFICH), physical downlink control channel (PDCCH) and physical mixed HARQ (HARQ) refer to Show symbol channel (PHICH).PCFICH is positioned in the first OFDM symbol of subframe, carries and relevant passes for controlling channel in subframe The information of the number of defeated OFDM symbol.PHICH transmits HARQ acknowledgement/non-acknowledgement in response to ul transmissions (ACK/NACK) signal.The control information carried on PDCCH is referred to as down link control information (DCI).DCI includes up Link circuit resource distribution information, downlink resource allocations information or the up-link for any UE group are launched (Tx) power and are controlled Order.PDCCH transmits the distribution of relevant resource and the information, relevant of the transformat for downlink sharied signal channel (DL-SCH) The information distributed for the resource of uplink shared channel (UL-SCH), the paging information of paging channel (PCH), relevant DL- The system information of SCH, about controlling the information of the resource distribution of message for higher level, such as, send on PDSCH is random Access response, the transmission power control command set of each UE for UE group, transmission power control information, Internet protocol language Active information of sound (VoIP) etc..Multiple PDCCH can send in control area.UE can monitor multiple PDCCH. PDCCH is formed by being polymerized one or more continuous print control channel element (CCE).CCE is for based on aerogram The compiler rate of the state in road provides the logical allocation unit of PDCCH.CCE corresponds to multiple RE groups.The form of PDCCH and can Bit number for PDCCH determines according to the dependency between the number at CCE and the compiler rate provided by CCE.ENB root According to being sent to the DCI of UE to determine PDCCH form, and cyclic redundancy check (CRC) (CRC) is increased to control information.According to The owner of PDCCH or purposes, sheltered by the identifier (ID) of referred to as radio network temporary identifier (RNTI) CRC.If PDCCH points to particular UE, then its CRC can be sheltered by the community RNTI (C-RNTI) of UE.If PDCCH carries Beep-page message, then the CRC of PDCCH can be sheltered by Paging Indicator identifier (P-RNTI).If PDCCH carrying system is believed Breath, specifically, system information block (SIB), then its CRC can be covered by system information ID and system information RNTI (SI-RNTI) Cover.In order to indicate PDCCH to carry accidental access response in response to the random access guiding sent by UE, its CRC can pass through Stochastic accessing RNTI (RA-RNTI) shelters.

Fig. 5 illustrates the structure of uplink sub-frames.Uplink sub-frames is divided into control area and data in frequency domain Region.The physical uplink control channel (PUCCH) carrying uplink control information is assigned to control area, and takes Physical uplink link shared channels (PUSCH) with user data is assigned to data area.In order to keep single carrier property, UE Asynchronously send PUCCH and PUSCH.In subframe, RB pair it is assigned to for the PUCCH of UE.The RB of RB couple is in two time slots Occupy different subcarriers.Therefore, it is stated that distribute to the RB of PUCCH to frequency hopping on time slot edge.

Reference signal (RS)

SRS is used for enabling the channel quality estimation of frequency selection scheduling on uplink.At this moment, perform SRS to pass It is defeated, regardless of whether the transmission of above-mentioned data and/or uplink control information transmission are how.SRS can be used for strengthening power and control Or support is used for the purposes of the various startup functions of the UE the most not dispatched.Such as, various startup functions include initially adjusting System and compilation scheme (MCS) select, the initial power control for data transmission, sequential in advance (TA) and so-called frequency Pseudo-selectivity is dispatched.At this moment, the scheduling of frequency quasi-semi-selection means the first Slot selection ground assigned frequency resource for subframe And pseudorandomly jump to the different frequency in the second time slot.

It addition, at wireless channel between up-link and downlink under reciprocal supposition, SRS can be used Downlink channel quality is estimated.This supposes share identical frequency spectrum in up-link and downlink and separate in the time domain Time division duplex (TDD) system in be particularly effective.

The subframe wherein being sent SRS by any UE in community is indicated by the specific broadcast signaling in community.4 bits Community specific " srsSubframeConfiguration " parameter instruction wherein can send SRS's in each radio frame 15 possible set of subframe.This configurability is depending on that deployment scenario provides motility in regulation SRS overhead.16th Configuration is completely cut off SRS in the cell, and this can e.g. be suitable for the community of mainly service high-speed UE.

As illustrated in figure 6, in the subframe of configuration, in last SC-FDMA symbol, perform SRS transmission all the time.Cause This, SRS and DM RS is located in different SC-FDMA symbols.The SC-FDMA symbol specified for SRS does not allow PUSCH Data are transmitted, and cause the detection expense of the worst case of up to 7% in each subframe.

Each SRS is produced by basic sequence (random sequence or ZC (Zadoff-Chu)-set based on sequence) Symbol, wherein for given time instance and bandwidth, all UE in community use identical basic sequence simultaneously in community In the identical time and the SRS transmission coming from multiple UE in frequency band by being assigned to the basic sequence of different UE not Same paging displacement is distinguished orthogonally.By not guaranteeing the different districts middle finger of orthogonality between different basic sequences Join different basic sequences and can distinguish the SRS sequence coming from different districts.

Reference Signal Received Power (RSRP)

RSRP can be defined as carrying the resource element (RE) of the specific BS in community (CRS) in the frequency bandwidth measured The linear average of power.UE can be mapped to the CRS of specific resources element by detection and determine RSRP and then Sent.RSRP is determined, substantially uses the specific RS in the community (R0) for antenna port #0.If UE can be reliable Ground detection is for the CRS (R1) of antenna port #1, then R1 can be additionally used for R0 and allows to determine RSRP.For community The details of specific RS (CRS), reference standard document (such as, 3GPP TS36.211).

LTE carrier received signal strength indicator (RSSI)

RSSI can be defined as in the measurement band observed by UE from including that cochannel Serving cell and non-serving are little Total reception (Rx) bandwidth power that all sources in district, continuous print channel disturbance, thermal noise etc. sense.RSSI can by with Make the input of Reference Signal Received Quality (RSRQ).

Reference Signal Received Quality (RSRQ)

RSRQ can provide community specific signaling quality characteristic, and can be similar to RSRQ.But, RSRQ can be by For the LTE candidate cell sorting different according to the signal quality of each community.Such as, it is considered if RSRP measures offer Be not enough to perform the information that stable mobility determines, then RSRQ measured value is used as transferring and reselects with community The input signal determined.RSRQ is defined as N × RSRP/E-UTRA carrier wave RSSI (receiving signalling intensity designator).Here, N It it is the number of Resource Block (RE) in the frequency bandwidth measured.It addition, in aforesaid formula, from the collection of identical RB set Conjunction can realize molecule (N × RSRP) and the measurement of denominator (E-UTRAN carrier wave RSSI).But, RSRP is expected letter The designator of number intensity, it is contemplated that the interference level being comprised in RSSI, it is strong that RSRQ can be used for report signal effectively Degree and the combined effect of interference.

Will be given below communicating with D2D the various embodiments of (also referred to as D2D directly communicates).Although below In will based on 3GPP LTE/LTE-A describe D2D communication, it is noted that D2D communication can also be applied to other lead to Communication system (IEEE 802.16, WiMAX etc.).

D2D communication type

According to whether perform D2D communication under network control, D2D communication can be classified into the D2D communication of the network coordination Communicate with spontaneous D2D.According to the degree of network interferences, the D2D communication of the network coordination can be classified into the first kind (only D2D In data), wherein D2D communication be used for only sending data；And Second Type (the only connection in network controls), wherein net Network only performs Access Control.Describing for convenience, hereinafter the first kind will be referred to as network centralized D2D communication class Type, and hereinafter Second Type will be referred to as distributed D2D communication type.

In network centralized D2D communication type, only at the swapping data of D2D UE, and can be performed by network Connection control between D2D UE and radio resources allocation (grant message).D2D UE can use by network allocation Radio resource sends and receives data and specific control information.Such as, for the data receiver between D2D UE HARQ ACK/NACK feedback or channel condition information (CSI) directly cannot be exchanged between D2D UE, and permissible It is sent to another D2D UE by network.In further detail, if network configures D2D link and by nothing between D2D UE Line electric resources distributes to the D2D link being configured, then transmission D2D UE and reception D2D UE can use radio resource to hold Row D2D communicates.In other words, in network centralized D2D communication type, the D2D between D2D UE can be controlled by network and lead to Believe, and D2D UE can use the radio resource by network allocation to perform D2D communication.

Compared with network in D2D communication type centralized with network, the network in distributed D2D communication type can be held The more limited effects of row.Although the network of distributed D2D communication type performs Access Control between D2D UE, but is not having (license disappears can spontaneously to take the radio resources allocation between D2D UE by the competition of D2D UE with the help of network Breath).Such as, in the case of not over network, the HARQ ACK/NACK being associated with the data receiver between D2D UE Or CSI directly can be exchanged between D2D UE.

As illustrated in the above example, according to the degree of the D2D Communication Jamming of network, D2D communication can be classified Network centralized D2D communication is become to communicate with distributed D2D.In this case, network centralized D2D communication type and distribution Formula D2D communication type is characterized in that performing D2D Access Control by network.

In further detail, the network for using in the D2D communication type of the network coordination can be only fitted to be scheduled with Perform the D2D link between the D2D UE of D2D communication so that the connection between D2D UE can be constructed.When at D2D UE Between configure D2D link time, physics D2D link identifier (LID) can be assigned to the D2D link being configured by network.When When there is multiple D2D link between D2D UE, physics D2D link ID is used as identifying the ID of each D2D link.

It is different from network centralized and distributed D2D communication type, with the help of there is no network, spontaneous D2D communication class Type can allow D2D UE to freely carry out D2D communication.That is, network centralized and distributed D2D communication type it is different from, spontaneous D2D communication type can control D2D UE and take spontaneously to perform Access Control and radio resource.If it is necessary, network There is provided the D2D channel information that can use in the corresponding cell can also to D2D UE.

The discovery of D2D UE

For convenience of description, it is scheduled to perform or is able to carry out including what the D2D that D2D directly communicates communicated UE, hereinafter will be referred to as D2D UE.If needing mutually to distinguish emitter and receptor, then be scheduled to send or Use the radio resource being assigned to D2D link can transmit data to the D2D of another D2D UE between D2D communication period UE, hereinafter will be referred to as transmitting (Tx) D2D UE, or be scheduled to receive or can receive number from Tx D2D UE According to another UE hereinafter will be referred to as receive (Rx) D2D UE.If be scheduled with receive or can be from Tx D2D UE receives multiple D2D UE of data and is used, then can also identify Rx D2D by the ordinal number of such as " first to N " UE.Describe for convenience, for controlling accessing or by radio resources allocation to the base station of D2D link between D2D UE Or be positioned at the node (such as D2D server and access/session management server) at network phase and hereinafter will (BS) It is referred to as network.

The D2D UE being scheduled to perform D2D communication needs to identify the adjacent D2D that can send and receive data in advance The existence of UE or do not exist, in order to transmit data to another D2D UE by D2D communication.For this purpose, D2D UE D2D peer discovery can be performed.D2D UE can perform D2D discovery to find to be spaced, and all of D2D UE can be total to Enjoy discovery interval.D2D UE monitoring can find the logic channel in region in finding interval, and therefore can be from other D2D UE receives D2D and finds signal.Receive the D2D UE of transmission (Tx) signal from another D2D UE and can use reception (Rx) The list of the D2D UE that signal structure is adjacent.It addition, D2D UE can broadcast the information of their own (i.e., in finding interval ID), and other D2D UE can receive broadcast D2D find signal so that can identify D2D communication usable range in phase The existence of the D2D UE answered.

The distribution of D2D transfer resource

Such as, D2D UE can perform D2D transmission to (or with signal send) the D2D resource area pre-build (and/or D2D receive), and accordingly, it would be desirable to suitable D2D Tx distribution of resource.For D2D Tx distribution of resource, base station (BS) D2D instruction/request signal or D2D data buffering status information can be received from D2D UE so that BS can identify quilt Dispatch the number (N) of the D2D UE communicated with execution with the D2D of the specific D2D UE in community.The most identified be scheduled with perform The BS of the number (N) of the D2D UE of D2D communication can distribute for allowing each D2D UE to send the money of D2D communication request signal Source, and the configuration information of the resource area being allocated to D2D UE broadcast.

Fig. 7 is the concept map illustrating D2D resource distribution according to an embodiment of the invention.

In the figure 7, D2D resource area can include 9 subframes, therein each includes 50 Resource Block (RB), and For D2D signal transmission 450 resource area of distribution.It addition, each second can send D2D signal.D2D signal is used for D2D Transmission/the reception of communication.Such as, the data that D2D signal can be used on the D2D communication resource send/receive, D2D finds Transmission/reception of signal etc..Configuration and the D2D of the D2D resource area illustrated in the figure 7 is disclosed only for illustrative purpose The transmission period of resource area.Such as, D2D resource area can also be by such as about 10 subframe groups set forth above for Fig. 2 Become.

As shown in Fig. 7 (a), whole D2D resource area interval is assigned to D2D UE, and D2D UE can select The radio resource for the transmission of D2D signal in whole D2D resource area.It addition, D2D UE can also be selected D2D signal is broadcasted in Tx resource.It addition, D2D signal can include the ID of D2D UE.But, if different D2D UE is in phase With time domain in select to have the Tx resource of orthogonal frequency, no matter the orthogonality then in frequency domain, owing to launching in band And performance degradation can occur.

In order to launch in reducing band, D2D resource area can be made up of multiple resource collections.Such as, as at Fig. 7 (b) Shown in, D2D Tx resource area can also be made up of 3 resource collections.During it addition, each resource collection can correspond to Different resource area in territory.D2D resource area is divided into several region in the time domain, causes each resource collection Formed.It addition, each D2D UE can also select D2D resource area in predetermined resource collection.Therefore, the most chosen The D2D UE of different resource collections can broadcast different D2D signals in the time domain.Such as, D2D signal can include D2D The ID of UE.D2D Tx resource is divided into several section in the time domain so that can reduce and select different resource set Launch in band between the different D2D UE closed.

It addition, each D2D resource collection can be associated with different districts.(BS) can include about mentioned above in base station D2D Tx resource in the information of resource collection that comprises.Such as, the D2D resource collection of associated each community can be by advance Determine.Specifically, it is contemplated that cell deployment, the D2D resource collection of application TDM is assigned to continuous community so that can reduce By the performance degradation launched in band or interference causes.

The D2D resource collection that is associated with each community can be directly or indirectly identified by each D2D UE Configuration.Such as, the D2D resource collection being associated with corresponding community can be obtained based on community ID.It addition, based in the ID of community The numeral comprised and the number of D2D resource area can also determine the D2D resource collection being associated with each community.Such as, logical Cross the modular arithmetic between the predetermined number and community ID of D2D resource collection to may determine that and to be correlated with corresponding community The D2D resource collection of connection.Such as, be assigned to the number of community ID can be 7 and five D2D resource collections can exist. In this case, the remainder that obtains when numeral " 7 " is divided by the number of D2D resource collection (that is, corresponding community) can To be associated with the 2nd D2D resource collection.Such as, relevant with the D2D resource collection of corresponding community code is inserted into community In ID so that D2D UE can indirectly obtain the D2D resource collection of corresponding community based on community ID.It addition, provide about D2D The information of configuration of source set can be directly included in such as SID (system information block), the specific D2D of UE control information, Or the specific D2D of D2D group controls in the broadcast message of information, and then can be transferred to D2D UE.

Meanwhile, as described below, when determining the D2D resource collection of D2D UE, the skew of each community is permissible It is considered.The skew of each community can be determined in advance.Such as, according to type and/or the ID of each community of each community The skew of each community can be predefined.It addition, the skew of each community can be reconfigured or comes for each community Say configurable.Furthermore it is possible to the ID of type from each community and/or each community obtains the skew of each community.It addition, it is every The skew of individual community can be directly included in the specific D2D of such as SIB, UE and be controlled information or the specific D2D of D2D group In the broadcast message of control information, and then can be transferred to D2D UE.

The determination of D2D resource collection

If D2D resource area includes multiple D2D resource collection, then D2D UE can be with logical in the case of being not changed in Based on crossing the D2D resource collection that the Serving cell of their own is specified.Serving cell can also be determined by conventional method.Example As, it is also possible to determine Serving cell based on RSRP measured value.

It addition, D2D UE can also select the D2D resource being associated with the community with optimal radio link quality Set.That is, D2D UE can use the radio link quality of such as RSRP as the reference selected for D2D resource collection. Such as, D2D UE can also select the D2D resource collection being associated with the community with optimal RSRP measured value.Have optimal The community of RSRP measured value can be the Serving cell of D2D UE.

It addition, D2D UE can use cell specific offset to measure to perform RSRP, or community can be used specific Skew determines D2D resource collection.Fig. 8 is the concept map illustrating the selection of D2D resource collection according to an embodiment of the invention.

In Fig. 8 (a), the Serving cell of a UE (UE#0) can be macrocell based on grand eNB (grand eNB).It addition, The Serving cell of the 2nd D2D UE (UE#1) can be picocell based on slight eNB (slight eNB) (pico cell).? In Fig. 8 (a), wherein identical for the RSRP of macrocell and the RSRP of picocell region can be represented by curve.Based on wherein Macrocell and picocell have the region of identical RSRP, and a D2D UE (UE#0) may be located at closer to grand eNB.Cause This, the RSRP measured value of the macrocell measured by a D2D UE (UE#0) can be more than the RSRP measured value of picocell. In this case, a D2D UE (UE#0) can determine D2D Tx according to the D2D resource set relevant with macrocell is incompatible Resource.It addition, the region that RSRP based on wherein macrocell is identical with the RSRP of picocell, the 2nd D2D UE (UE#1) is permissible It is positioned at closer to slight eNB.Therefore, the RSRP measured value of the picocell measured by the 2nd D2D UE (UE#1) can be big RSRP measured value in macrocell.In this case, according to the D2D resource collection relevant with picocell, the 2nd D2D UE (UE#1) can also determine D2D Tx resource.

But, as it has been described above, D2D UE can consider that community specifically offsets and RSRP measured value.Such as, according to isomery Network design, higher skew can be applied to the community of less size.That is, the size of cell coverage area can with accordingly Community shift into inverse proportion.In Fig. 8 (b), such as, picocell can have more higher skew than macrocell.At Fig. 8 B, in (), the region that wherein summation of the RSRP of each community is identical with the summation of the skew of each community can also be positioned at first Between D2D UE (UE#0) and grand eNB.Therefore, the skew of the macrocell measured by a D2D UE (UE#0) is total with RSRP's With skew and the summation of RSRP that can be less than picocell.In this case, a D2D UE (UE#0) can basis The D2D resource set that is associated with picocell is incompatible determines D2D Tx resource.Therefore, a D2D UE (UE#0) and the 2nd D2D UE (UE#1) can determine D2D Tx resource according to the D2D resource set relevant with picocell is incompatible.

The skew of each community can be determined in advance, and can be from the type of each community and/or each community ID obtains.D2D UE can confirm that type (such as, macrocell, picocell etc.) and/or the community ID of corresponding community, makes Obtain D2D UE and can obtain the skew of corresponding community.It addition, the skew of each community can be directly included in such as The specific D2D of SIB, UE controls in the broadcast message of information or D2D group specific D2D control information, and then can be by It is sent to D2D UE.

The Serving cell of D2D UE may also be distinct from that the community with optimal RSRP.Such as, if continuous community Predetermined level that RSRP value is higher than the RSRP value of Serving cell, then measurement report can be triggered.When at Serving cell RSRP value less than predetermined threshold value or less time perform cell reselection (or transfer) when, continuous community RSRP value can also be higher than the RSRP value of Serving cell.

With reference to Fig. 9, the Serving cell of D2D UE (UE) can be represented by " grand eNB 0 ".But, as shown in FIG. 9, The continuous community (grand eNB 1) of D2D UE (UE) can also have the RSRP of excellence.Will be given below for when substituting The RSRP of the community (such as, continuous community) of Serving cell is better than selecting during the RSRP of Serving cell the D2D resource set of D2D UE The method closed.

If continuously the RSRP value (or RSRP and the summation of skew) of community be higher than Serving cell RSRP value (or RSRP and the summation of skew), then D2D UE may determine that D2D Tx resource and the synchronization of D2D signal transmission.

First, D2D UE can also select with the community with the highest RSRP value (or RSRP and the summation of skew) The D2D Tx resource comprised in relevant D2D resource collection.If as it has been described above, D2D UE uses and has the highest RSRP value The D2D resource collection that the community of (or RSP and the summation of skew) is relevant, then be configured to use different D2D resource collections The geographical distribution of D2D UE can be isolated.In this case, D2D UE can also be according to having the highest RSRP value Time and/or the Frequency Synchronization of (or RSRP and the summation of skew) send D2D signal.

But, connecting if configuring RRC (radio resource control) in D2D UE, then D2D UE is according to Serving cell Synchronize to send signal so that can ask to need to send according to the synchronization of continuous community (there is the community of optimal RSRP value) The additional synchronization circuit of D2D signal.Accordingly, it is possible to the transmission (Tx) being relatively difficult to change the D2D UE wherein configuring RRC synchronizes, And it is likely encountered the cost for realizing additional synchronization circuit and/or complexity.Method mentioned above can also be suitable for In the D2D UE being maintained in RRC idle condition.

It addition, D2D UE selects relevant with the community with the highest RSRP value (or RSRP and the summation of skew) The D2D Tx resource comprised in D2D resource collection, and the time of D2D UE and/or Frequency Synchronization can also be with Serving cells Based on those.The D2D UE that may be relatively difficult to use wherein RRC to be configured changes transmission (Tx) synchronization, and is used for realizing Cost and/or the complexity of additional synchronization circuit are likely to occur so that method mentioned above may adapt to wherein RRC quilt The D2D UE of configuration.

Therefore, D2D UE selects relevant with the community with the highest RSRP value (or RSRP and the summation of skew) The D2D Tx resource comprised in D2D resource collection, and according to whether RRC connects the different modes being configured can select the time And/or Frequency Synchronization.Such as, the D2D UE being in RRC idle condition can also according to have the highest RSRP value (or RSRP and the summation of skew) time of community and/or Frequency Synchronization perform the transmission of D2D signal.It addition, such as, wherein RRC Connect the D2D UE that is configured can according to have the highest RSRP value (or RSRP and the summation of skew) community (and/ Or Serving cell) relevant D2D resource collection, or the time and/or Frequency Synchronization according to Serving cell perform D2D signal Transmission.

But, although continuously the RSRP value (or RSRP and the summation of skew) of community is higher than the RSRP value of Serving cell (or RSRP and the summation of skew), but D2D is UE, and (such as, wherein RRC connects the D2D UE being configured) can also be according to clothes The time of business community and/or Frequency Synchronization use the D2D resource set incompatible execution D2D signal transmission of Serving cell.If used The time of Serving cell and/or Frequency Synchronization perform the transmission of D2D signal, then the D2D UE being scheduled to receive D2D can be Perform blind search in the range of the frequency being preconfigured or send with signal and/or timing error, and can detect/receive The D2D signal received from another D2D UE.

In embodiment mentioned above, can define to be applied to being limited D2D search signal Tx/Rx operation (with/ Or D2D signal of communication Tx/Rx operation) rule.It addition, in embodiment mentioned above, can be with reality mentioned above Execute example and can be applied to wherein perform in the network coverage situation of D2D communication with being limited (and/or wherein outside the network coverage Perform D2D communication situation) mode define rule.

Above-described embodiment corresponds to key element and the feature of the present invention with prescribed form combination.It addition, respective key element or Person's characteristic can be considered to be selection, unless otherwise mentioned.It is capable of with the form not combined with other key elements or feature Each in key element or feature.Furthermore, it is possible to realized the enforcement of the present invention by integration factor the most together and/or feature Example.The order of the operation of each embodiment explanation of the present invention can be revised as.Some configuration or feature energy of one embodiment Enough it is included in another embodiment, or corresponding configuration or the feature of another embodiment can be replaced by.It addition, Obviously it will be appreciated that the claim can not in the appended claims by combination with the relation of explicit reference is come Configure embodiment or can be included as new claim by amendment after submitting application to.

It will be appreciated by those skilled in the art that in the case of without departing from the spirit and essential characteristics of the present invention, this Bright can implement the present invention in other specific forms.Therefore, it is explanation that above embodiment will be considered as at all of aspect Property rather than restrictive.The scope of the present invention should by appending claims and they legal equivalents rather than Determined by above description, and fall into all changes in the meaning of appended claims and equivalency range and be intended to quilt Contain wherein.

Industrial applicibility

Embodiments of the invention as above can be applicable to various mobile communication system.

Claims (12)

1. one kind is used in a wireless communication system in order to device-to-device (D2D) communication is sent by first user equipment (UE) The method of D2D signal, including:

Select the specific resources set in the D2D resource area for described D2D communication configuration；And

At least one radio resource corresponding with described specific resources set is used to send described D2D signal,

Wherein, described D2D resource area includes multiple resource collection, and

Wherein, the plurality of resource collection is interrelated with different districts and corresponds to the different resource region in time domain.

Method the most according to claim 1, wherein:

According to the identifier of the community being associated with the plurality of resource collection, determine described in described D2D resource area The configuration of multiple resource collections.

Method the most according to claim 1, wherein, the configuration of the plurality of resource collection in described D2D resource area It is comprised in system information block (SIB), UE specific D2D control information or D2D group specific D2D control information extremely In few one, and received from base station (BS).

Method the most according to claim 1, wherein, the specific resources set of described selection is associated with following community Resource collection, this community is to have maximum Reference Signal Received Power among the community relevant with the plurality of resource collection (RSRP) community.

Method the most according to claim 4, wherein:

Control (RRC) if a described UE configuration radio resource to connect, then according to the Serving cell of a described UE Time synchronized sends described D2D signal；And

If a described UE is in RRC idle condition, then according to the community relevant with the specific resources set of described selection Time synchronized send described D2D signal.

Method the most according to claim 1, wherein:

If configuring radio resource in a described UE to control (RRC) connection, the specific resources set of the most described selection is The resource collection relevant with the Serving cell of a described UE；And

The time synchronized of the Serving cell according to a described UE sends described D2D signal.

Method the most according to claim 1, wherein, the specific resources set of described selection is the money relevant with following community Source is gathered, and this community is that (reference signal receives merit to the RSRP that has among multiple communities that the plurality of resource collection is relevant Rate) and the community of maximum summation of skew.

Method the most according to claim 7, wherein, the skew of each community relevant with the plurality of resource collection and institute The covering size stating community is inversely proportional.

Method the most according to claim 7, wherein, the skew of each community relevant with the plurality of resource collection is wrapped Be contained in system information block (SIB), the specific D2D of UE controls at least in information or D2D group specific D2D control information In individual, and received from base station (BS).

10. one kind is used in a wireless communication system for the standby subscriber equipment sending D2D signal to equipment (D2D) communication (UE), including:

Radio frequency (RF) unit；And

Processor,

Wherein, described processor is configured to:

Select the specific resources set in the D2D resource area for described D2D communication configuration, and use specific with described Corresponding at least one radio resource of resource collection sends described D2D signal,

Wherein, described D2D resource area includes multiple resource collection, and

Wherein, the plurality of resource collection is interrelated with different districts and corresponds to the different resource region in time domain.

11. subscriber equipmenies according to claim 10 (UE), wherein, the specific resources set of described selection is little with following The resource collection that district is associated, this community is that the maximum reference that has among the community relevant with the plurality of resource collection is believed Number receive power (RSRP) community.

12. subscriber equipmenies according to claim 11 (UE), wherein:

Control (RRC) if a described UE configuration radio resource to connect, then according to the Serving cell of a described UE Time synchronized sends described D2D signal；And

If a described UE is in RRC idle condition, then according to the community relevant with the specific resources set of described selection Time synchronized send described D2D signal.